Bug 2558725 (CVE-2026-114723)

Summary: CVE-2026-114723 roundcubemail: roundcubemail: Denial of Service (DoS) via memory exhaustion during thumbnail generation
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
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Priority: low    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in Roundcube Webmail. A remote attacker can cause a Denial of Service (DoS) by submitting a crafted image with excessively large dimensions. When thumbnail generation falls back to the GD graphics library on non-Windows platforms, available-memory checks are not enforced. This allows the application to process the image without resource limits, potentially exhausting server memory.
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Bug Depends On: 2562391, 2562392    
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Description OSIDB Bzimport 2026-10-22 02:02:16 UTC 
Roundcube Webmail before 1.6.20 and 1.7.x before 1.7.5 allows the ImageMagick resource limits to be bypassed during thumbnail generation. When rcube_image falls back to GD, the available-memory check was applied only on Windows, so on other platforms a crafted image with large dimensions was processed by GD without any resource limit and could exhaust server memory. Upstream fixed this in the commit “Fix ImageMagick resource limits bypass by GD fallback during thumbnail generation”, which applies the memory check on all platforms.